School shootings are rare in Brazil, even though the country is one of the world's most violent, with more annual homicides than any other.

The men, identified as former students at the school in a suburb of Sao Paulo, also shot and killed the owner of a used auto business nearby before launching the attack on the school, authorities said.

The last one occurred in 2011, when the former student of a school returned and shot 12 children fatally, Fox News reports.

Another shooting that took place about 500 metres from the school happened before the killings, but it was not yet clear if the two incidents were linked.

Brazil's new President Jair Bolsonaro recently announced that gun ownership controls would be loosened.

Gun laws are strict in Brazil, but it is not hard to purchase a weapon illegally.

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